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DFGRD0=I cound not find what is wrong

Hello everyone.


I am trying to do something with the deformation gradient in UMAT. I used F=DFGRD0 as the gradient. but i found that it always comes to be a identity tensor not only for the case of a 3d isotropic elastic material but also for the ramberg osgood model. it was very surprising for me so i also tried to print DFGRD1 it was also identity tensor.

I have used a C3D8 single element and was doing the uniaxial test. Please help me out with this

The documentation says, 

"This array is set to the identity matrix if nonlinear geometric effects are not included in the step definition associated with this increment."

I hope that helps.

thank you very much.

That was of great help.


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